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A member asked:
Does the antibiotic cephalexin make birth control pills less effective?
A doctor has provided 1 answer
No: The current thinking is that except for rifampin, other commonly-used antibiotics (such as cephalexin and many others) do not alter the effectiveness of birth control pills. This is likely presuming a person is not sick with vomiting or rapid diarrhea, or some other condition that decreases the absorption of a swallowed pill. One can look up: http://www.ncbi.nlm.nih.gov/pubmed/12063491
Answered 9/30/2018
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